Shift Dividend Left

F4D7: 26 F6		ROL	M2+1	SHIFT DIVIDEND LEFT
F4D9: 26 F5		ROL	M2
F4DB: B0 1C		BCS	OVFL	OVFL IS DUE TO UNNORMED DIVISOR
F4DD: 88		DEY		NEXT DIVIDE ITERATION.
F4DE: D0 DA		BNE	DIV1	LOOP UNTIL DONE 23 ITERATIONS.
F4E0: F0 BE		BEQ	MDEND	NORM. QUOTIENT AND CORRECT SIGN.
F4E2: 86 FB	MD2	STX	M1+2
F4E4: 86 FA		STX	M1+1	CLEAR MANT1 (3 BYTES) FOR MUL/DIV.
F4E6: 86 F9		STX	M1
F4E8: B0 0D		BCS	OVCHK	IF CALC. SET CARRY,CHECK FOR OVFL
F4EA: 30 04		BMI	MD3	IF NEG THEN NO UNDERFLOW.
F4EC: 68		PLA		POP ONE RETURN LEVEL.
F4ED: 68		PLA
F4EE: 90 B2		BCC	NORMX	CLEAR X1 AND RETURN.
F4F0: 49 80	MD3	EOR	#$80	COMPLEMENT SIGN BIT OF EXPONENT.
F4F2: 85 F8		STA	X1	STORE IT.
F4F4: A0 17		LDY	#$17	COUNT 24 MUL/23 DIV ITERATIONS.
F4F6: 60		RTS		RETURN.
F4F7: 10 F7	OVCHK	BPL	MD3	IF POSITIVE EXP THEN NO OVFL.
F4F9: 4C F5 03	OVFL	JMP	OVLOC
		ORG	$F63D
F63D: 20 7D F4	FIX1	JSR	RTAR
F640: A5 F8	FIX	LDA	X1
F642: 10 13		BPL	UNDFL
F644: C9 8E		CMP	#$8E
F646: D0 F5		BNE	FIX1
F648: 24 F9		BIT	M1
F64A: 10 0A		BPL	FIXRTS
F64C: A5 FB		LDA	M1+2
F64E: F0 06		BEQ	FIXRTS
F650: E6 FA		INC	M1+1
F652: D0 02		BNE	FIXRTS
F654: E6 F9		INC	M1
F656: 60	FIXRTS	RTS
F657: A9 00	UNDFL	LDA	#$0
F659: 85 F9		STA	M1
F65B: 85 FA		STA	M1+1
F65D: 60		RTS

II specifications

The Apple II, launched in April 1977, was one of the first highly successful mass-produced microcomputer products. It marked a significant leap in personal computing, setting standards for future developments in the industry. Created by Steve Wozniak and Steve Jobs, the Apple II differentiated itself with its user-friendly design, appealing aesthetics, and robust capabilities.

One of the standout features of the Apple II was its open architecture, which allowed users to expand and enhance the computer's functionality. This design enabled hundreds of third-party hardware and software developers to contribute to its ecosystem, resulting in an array of peripherals, including printers, modems, and storage devices. The Apple II utilized a MOS Technology 6502 microprocessor running at a clock speed of 1 MHz. Initially equipped with 4 KB of RAM, the machine could be expanded to 48 KB, accommodating more complex applications and programs.

The Apple II was also notable for its colorful graphics. It was one of the first computers to support color display, offering a 6-color palette with a resolution of 280x192 pixels in 16 colors when using its Color Graphics Card. This feature significantly enhanced the visual appeal of games and educational software developed for the platform, making computing more accessible and entertaining for various audiences.

Apple's commitment to user experience was evident in the design of the machine. It featured an integrated keyboard and a plastic case, which was both durable and visually appealing. The self-contained design included drive bays for floppy disk drives, allowing for quicker data access than traditional tape drives. It also supported audio output, enabling sound effects and music, a novelty at the time.

The introduction of the Apple DOS operating system further underscored the machine's capabilities. DOS streamlined file management and made it easier for users to navigate and manage their data. The combination of hardware and software positioned the Apple II as an educational tool and a gaming platform, fostering a vibrant software ecosystem.

The Apple II family continued to evolve, with variations like the Apple II+, IIe, and IIgs being introduced over the years. These iterations brought enhancements in memory, processing power, and graphics capabilities. The legacy of the Apple II endures, not only as a foundational product in personal computing but also as a symbol of innovation that paved the way for future advancements in technology. Its impact is still felt today, as it inspired countless developers and shaped the trajectory of the computer industry.

Apple II manual Shift Dividend Left

Models: II

EOR

II specifications